Indicator



A. G. FENN.

INDICATOR.

APPLICATION FILED 061121.15119.

-1 348, 1 62 Patented Aug. 3, 1920.

INI/ENTER ARTHUR Gr. FENN, OF HARTFORD, CONNECTICUT.

INDICATOR.

Specification of Letters Patent.

Patented Aug. 3, 1920.

Application inea oiober 21, 1919.V serial No.l 332,168.

To all 107mm. t may conce/ML:

Be it known that I, ARTHUR Gr. FENN, a citizen of the United States, and a resident of Hartford, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Indicators, of which the following is a specification.

This invention relates to indicators for testing the trueness of various kinds of machine work and has as its aim to provide a test indicator provided with improved means having features of noveltyand advantage for tensioning the indicating pointer or fingery and adjusting the same to a variable zero position.

In the accompanying drawing, I have illustrated one embodiment of my invention, but it is to be understood that the present disclosure is illustrative only and not restrictive of my conception, for the device is susceptible of various modifications and changes which may come within the purview of the annexed claims.

In the accompanying drawing Figure 1 is a plan view of a test indicator to which my improvements are applied.

Fig. 2 is a longitudinal sectional view thereof.

Fig. 3 is a perspective View on an enlarged scale of my improved means for tensioning and setting the pointer of the indicator, and

Fig. 4 is a fragmentary view showing a detail of construction.

In Figs 1 and 2 of the drawing, I have shown, for illustrative purposes, my improvements applied to an old and wellknown type of indicator. This indicator has a base a, a lever b pivoted on the posts c, and an indicating pointer d pivoted on posts e and having its free end overlying a scale f. The forward end of the lever b is adapted to be brought into contact with the work to be trued up. vThe rear end'of the lever b has a slot h through which extends a pin c' carried by the-pointer d adjacent its pivoted end. The lower end of the pin i extends into a recess 7c at the rear end of the base a. With the construction so far described, it will readily be seen that upon a slight movement of the forward end of the lever b the pointer d will swing through a relatively greater arc over the` scale f.

By my invention, I add to the above construction certain improvements which will now be described. 10 is a stud rotatably mounted in an opening ina boss 11 on the base and having a head 12 located in a circular seatat the forward end of the recess 7s. Connected to this head 12 is a pair of flat springs 13 which, at their free ends, straddle the lower end ofthe pin c'.

y In the present instance, yI have shown the springs 13 cooperating with the pin i and, while this is the preferred arrangement, I do not wish to limit the invention thereto as a separate pin or part on the pointer or lever ymay be provided for this purpose. The ends of the springs 13 may be located in saw cuts in the head 12 of the stud, as shown in` Fig. 3. Upony the lower-end of the stud 10 is Xed'a handle 14 preferably of spring material and having frictional engagement against the lower surface of the base a. Upon the outer end vof the handle 14 is a pair of ears 15 straddling the base a and theseears serve as thumb and finger pieces for ready manipulation of the handle. They also constitute stops to limit movement of the handle. To prevent relative rotation between the handle 14 and the stud 10, the opening in the handle and the portion of the stud which this open- .handle 14 is manipulated to rotate the'stud 1() and the springs 13 in the proper direction. Movement of the springs 1,3 changes the position of the pin z' and thus varies the angular positions ofthe lever b and indicating pointer d. It requires but a slight rotary movement of the stud 10 to swing the free end of the indicating pointer al through the full length of the scale as the springs 13 are relatively long. In any position of adjustment of the pointer, the springs 13 exert the same tension thereon for, when changed from one position to another, they rotate .in unison with the stud 10 and the springs being fiat the pin z'v may have a slight movement therebetween so as to allow the pin c' and the spring to be swung about different centers. The pointer is held in any position of adjustment due to the frictional engagement of the handle 14 with the base a.

I claim as my invention 1. In an indicator of the class described,

' adjacent the pivot of the latter, of a rotary the combination Witha base, a pivoted indicating pointer having a fixed part, and a lever operatively connected to the pointer stud carried by the base and spaced from the pivot of said pointer, a pair of springs carried by the stud and engaging said partV fixed on said pointer, and meansvfor rotat-A ing sai d stud.

2. In an indicator of the class described, 'the combination with a base, a lever pivoted dling said pin, and means for angularly I moving said springs. y

In an indicator of the class described, the combination with' a base, ay lever pivoted thereon, a pivoted indicating pointer, and a pin forming a connection between said lever andY pointer, of a rotary stud, a pair of straight springs carried by the stud and straddling said pin, and means for rotating the stud. i y

4. 1n an indicator of the class described, in combination with a base, a leverpivoted thereon, a pivoted indicating pointer operatively connected to said lever, and a pinon iii combination With a base, a lever pivotedV thereon, a pivoted indicating pointer operatively connected to said lever, and a pin Von said pointer, of. a rotary stud on said base, a pair of springs carried thereby and straddling said pin, and a handle `on said stud frictionally engaging said base and havingvat its face end ears between which the base is positioned. Y

6. In an indicator of. the class described,

in combination with a base, a lever pivoted` thereon, a pivoted indica-ting pointer operatively connected tosaid lever, and a pin Von said pointer, of a rotary stud on the base,

a pair of straight springs carried thereby and straddling said pin,anda handle .having an opening Withfa non-circular side rethe'stud, said handle having frictional engagement with said base and havin-g in its freeend earsV betweenwhicli the base is vceiving a correspondingly shaped partQof l 

